Children ages 2-5 who received the COVID-19 mRNA vaccine faced an increased risk of febrile seizures immediately following vaccination, according to a new study led by researchers at the U.S. Food and Drug Administration (FDA).

The preprint study found children who received the Moderna shot were 2.5 times more likely to have a febrile seizure within a day of being vaccinated than they were to have one between eight and 63 days following vaccination.

The incidence rate ratio was “significantly elevated,” the researchers wrote, but the “absolute risk” — the risk of having a seizure following vaccination, was low within the first day following vaccination.

FDA researchers also found a higher risk of febrile seizures among children ages 2-4 on the first day following the Pfizer vaccine than in the 8-63 days following vaccination. However, that increased risk was not statistically significant, the researchers reported.

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